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From Jack Krupansky <>
Subject Re: Mix Solr 4 and 5?
Date Fri, 22 Jan 2016 15:10:37 GMT
Just to be clear, are you talking about a single app that does SolrJ calls
to both your CMS and your free text search index? So, one Java app that is
simultaneously sending requests to two Solr instances (once 4, one 5)?

-- Jack Krupansky

On Fri, Jan 22, 2016 at 1:57 AM, <>

> Hi,
> Long story short, we use a CMS that is integrated with Solr 4.6, with the
> solrj jar file in the global/common Tomcat classpath. We currently use a
> Google Search Appliance machine for our own freetext search needs, but plan
> to replace that with some other solution in the near future. Since we
> already work with solr because of the CMS integration, we would like to
> select solr for this project.
> But I would prefer to use the latest version, ie solr 5, and I am not sure
> how that would work in our situation. Can we use the solrj client for solr
> 4 when indexing and searching on a solr 5 server? If so, would we miss some
> important feature, and would this setup be future proof?
> Or can we somehow use both solr4 and solr 5 client libraries at the same
> time, in the same context? It is not possible to upgrade the solr server
> that the CMS is using, and it is not possible to remove the 4.6 solrj jar
> from the common classpath in Tomcat. That is, unless the solr 5 version of
> solrj is backwards compatible, so that we can switch the jar files and our
> CMS would still be able to index and search in it's own solr 4 server.
> What would you say that our options are? I would really not like having do
> low level http calls to the solr 5 server.
> Regards
> /Jimi

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